Adjustment arm



FIG. 1 is a right rear perspective view of an adjustment arm inaccordance with our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof, a left-side elevationalview thereof being a mirror image;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing of the model railroad truck assembly and couplerin FIG. 1 is for illustrative purposes only and forms no part of theclaimed design.

The ornamental design for an adjustment arm, as shown and described.